Add comma

addons/addon-attach/webpack.config.js

@@ -25,7 +25,7 @@ module.exports = {
     filename: mainFile,
     path: path.resolve('./lib'),
     library: addonName,
-    libraryTarget: 'umd'
+    libraryTarget: 'umd',
     // Force usage of globalThis instead of global / self. (This is cross-env compatible)
     globalObject: 'globalThis',
   },